Friction-brake.



J. F. CUMMINGS.

, FRICTION BRAKE.

APPLICATION FILED MAR. 27, 1908. 925,303, Patented June 15, 1909. 2 SHEETS-SHEET 1.

Snuaul'oz fa/z); f CMWMIZLIZWS J. F. CUMMINGS.

FRICTION BRAKE. APPLICATION FILED M51147, 1908. a Patented June 15, 1909.

ururiin srrrns lE Al-ENT QFFhUllh JOHN F. CUMMINGS, F PROVIDENCE, RIIODE ISLAND.

FRICTION-BEAR.

Specification of Letters Patent.

Patented June 15, men.

Application iiled'kiareh 27, 1908. Seriel No. 423,576.

To all whom it gins-y concern.

Be it known that 1, JOHN F. ffmuumos, a

citizen of the United States of America, residing at Providence, m the county of Proviand one of the principal objects of the'seme is to provide a double friction brake in which there is a stationary central member and a movable inner and outer member, the outer member serving its a hand brake and the innor member serving as a foot brake.

Another object of the invention is to pro vide a. brake com rising a stationary member having V-shepe angular grooves therein upon both its inner and outer sides and a brake shoe comprising a series of if-shaped ribs to engage the grooves of the stationary member.

These and other objects may be attained by means of the construction illustrated in the accompanying drawings, in which,

Figure 1 is a central vertical section taken through a brake mode in accordance with my invention. with one of the casing heads removed. Fig. 3-is a detail sectional view on the line 3-3 of Fig. 2. Fig. 4 is a perspective view of the strap or ring carrying the ll-shaped ribs. Fig.5 is a similar view of the intermediate or stationary member. 6 is a similar view of the inner member. Fig. 7 is a detail sectional view of u modified form.

Referring to the drawings for amore specific description of my invention, the numeral 1 designates a shaft, and mounted on this shaft is the stationary member 2 of the brain: which is provided with :1- boss 3 through which the shaft 1 passes, an integral head or disk and a peripheral surface composed of a series of ti-shaped grooves i, while the inner surface is also provided with a sc-- ries of similar grooves 5, as shown more particularly in Fig. 1. A face plate 6 provided with a boss 7 through which the shaft 1 passes is secured to the opposite side of the ionary member.

A resilient metal band 8 surrounds the stationary member 2 and is provided with. a. sorics of curved ribs 9 of the required shape to lit within 'the groove d of the member 2.

he ii 115 9 are slightly larger than the grooves in order that the ends oftho ribs will not Fig. 2 is an end View of the same reach the bottom of the grooves when the the center of'the resilient bond 8, as shown in Fig. 2, and at the terminal ends of the band 8 bearings 11, 12 are provided, said bearings having spaced lugs 13, 14, and said bearings being connected by rivets 15 to the band 8. 'Yivoted between the in s leis a.

point of said lever.

A connecting rod 18 is pivoted at 19 to the bearing 11, and upon the outer end of said connecting rod screw threads 20 are pro-- upon the threaded portion of the rod 18, and s ifurcated keeper 22 is connected by 2. bolt 23 to, the lever 16. A hand operating bar or lever 24 is connected to the end of the lever nut 21 may be adjusted upon the rod 18 to determine the depth at which the ribs 9 are permitted to enter the grooves 4.

' On the interior of the stationary member 2 is a brake comprising two members 25 pivotully crinnected together upon the bolt 26 which extends through the enlarged portions of said members and rojecting through. a. boss 27 upon the face p etc 6, e nut 28 being The members 25 are each provided upon their outer surface with curved ribs de signed to engage the grooves 5 in the interior of the stationary member 2. The members 25 are provided with enlarged ends 80, and a spring 31 is connected tosaid enlargements, the tension of ssid spring being exerted to draw the ends of the members 25 together and to relieve the bearing of the ribs 29 in grooves A lever 32 is fixed to the stud 33 projecting through it boss 34 on the face plate 6, and formed integral with the stud 33 is s cam 35 having oppositely disposed rounded corners 36. VVhen the lever is depressed at its outer end by-means of n foot trundle, not shown, the rounded corners 86 beer outward upon the enlargement 34.) oi the members 25 and crowd the ribs 29 within the g1ooVes-,5, and when pressure upon the lever 32 is released the spring 31 draws the parts 35 together to release the ribs 29 from the groovcsb.

i As shown in Fig. 7 the ribs 9 01'29 areniodi ll'lull. to some extent. Instead of melting solid ribs they may be made hollow, as shown at 9, and said ribs are secured by means of L i'nstenings (L at suitable points, said fasten-1 brake is applied. A bracket 10 is secured to vided. A stop nut 21 is adjustubly mounted 16 for applying the brake band. The stop provided for securing said parts in piece.

curved lever 16, a. bolt 17 forming t e pivotal ings assing through the metal from which;

the n s are formed and into the member 25 or 8, v

From the foregoing it will be obvious that my brake is operative by a hand lever and by a foot lever, and that whenevev r an emergency brake is required both of said brakes may be zip lied.

v Iy brake is of comparatively simple construction, and owing to the V-sheped grooves and similarly shaped ribs a very large brake surface is provided and a very powerful brake obtained.

Having thus described the invention, What is claimed as new, is:

A brake comprising an intermediate mern-r ber mounted upon a shaft and comprising a ring provided with exterior peripheral I grooves and intermediate ribs, the interior surface of said member being provided with ribs and intermediate grooves, an outer brake member comprising a resilient band, means for applying said outer brake member, an inner brake comprising pivoted members having exterior ribs to fit the interior grooves, and means for applying said inner brake.

In testimony whereof I aflix my signature in presence of two Witnesses.

' JOHN F. CUMMINGS.-

Witnesses WALTER D. BnoWNELL, WALTER F. WILLIS. 

